I photographed this black-browed albatross on the way down to Antarctica. I used a 500mm telephoto, but due to the shallow depth of field of the long lens, the iceberg in the background wasn't sharp. So, after I captured the bird in flight, I took a second shot of the background, making sure it was in focus. I then put the two pictures together. Out of focus backgrounds are acceptable and even desirable if they are non-distracting and direct all of the attention to the subject. However, if they are 'almost' sharp and they are beautiful enough to be appreciated, then they should, ideally, be sharp. My settings for both images were 1/1600, f/10, and 200 ISO.